Terahertz probing of sunflower leaf multilayer organization

Abstract

We analyze the multilayer structure of sunflower leaves from Terahertz data measured in the time-domain at a ps scale. Thin film reverse engineering techniques are applied to the Fourier amplitude of the reflected and transmitted signals in the frequency range f < 1.5 Terahertz (THz). Validation is first performed with success on etalon samples. The optimal structure of the leaf is found to be a 8-layer stack, in good agreement with microscopy investigations. Results may open the door to a complementary classification of leaves.

Analysis of sodium copper chlorophyllin and sodium magnesium chlorophyllin by time-domain THz spectroscopy

“…The measured THz spectra of these chlorophyll derivatives are a significant contribution to the collection of biomolecular crystals spectra which are currently accumulated in the literature. Promoting such investigations to chlorophyll in plants offers a rich but challenging field of study 6,7 .…”

Investigating the low-frequency vibrations of chlorophyll derivatives using terahertz spectroscopy

“…Extension of such investigations to chlorophyll in plants offers a rich but challenging field of study. 11…”

Terahertz time domain spectroscopy data processing: analysing uncertainties to push boundaries

“…The idea was quickly used for spectroscopy [2] and a few years later, the integration of photoconductive antennas [3,4] brought it to a practical broadband THz spectroscopic system. They enabled myriads of applications from semiconductor spectroscopy [5,6], 2D materials [7], liquids [8], biological samples [9,10] and carbohydrates [11,12]. More recently, the measurements of band-pass filters [13] and metasurfaces embedded in microfluidic circuitry [14] were presented along with more fundamental studies of, for instance, ultra-strong coupling [15,16].…”